Calipers.



P. J. ROBINSON.

OALIPERS.

APPLICATION FILED MAR.11,1914.

Patented Sept. 1,1914

$HEET 1.

7HE NORRIS FETEFFS c0 FHOTO-LITHOH WASHINGTGN. D. C.

P. J. ROBINSON.

-CALIPEBS.

APPLICATION FILED MAR; 11, 1914.

Patented Sept. 1. 1914.

3 SHEETSSHBET 2.

m W H IHE NORRIS PETERS co.. PHOTO-LITHO. WASHINGTON. u z".

P. J. ROBINSON.

CALIPERS.

APPLICATION FILED MAR.11, 1914.

1,109,467. Patnted Sept. 1, 1914.

3 SH'BETSSHEET s.

.THE NORRIS PETERS C0,,Ff401U-LITHQ, WASHINGTDN u. c.

u To all whom it may 00mm: r

UMTED O FIC -Y ,PHILIYP'VJ. ROBINfOifLOF LEQMIIQS'IEB, MASSACHUSETTS. 7

w oALrriins.

Be, it known that I, PH LIP acitizen of the United States', residing, at

Leoniinster, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements inCalipers; and I do hereby deolaretheifollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in theart to whicl iit appertains to make and use the same,

1 This. invention relates round bodies.

; The primary object ofthis iiivention is the provision of a tool as specified embody? 1 ing various adjustable parts, by the adjustment of whichthe toolinay be converted-l into calipers for. various {uses, such las iii'-' teriial and exteriorfmeasuring, dividers, or various other measuring tools whichwillhe hereinafter inore tully described? View this invention consistsnin such novel features of construction, combination and arrangement of parts as will'be hereinafter more fully described, illustrated intlie actool adjusted for jou'tsideor exterior ineasuring. Fig. 2 shows the parts adjusted to form; hermaphrodite calipers. Fig. 3 a shows the parts adjustedto forin dividers of extended radial capacity, Fig. 4: is a view ig/3, showing the pal-ts Ofth similar to I. caliper adjusted for Fig. 5.; is aview: showing the parts adjusted for outside or exterior nieasuring, and eX- pacity ot the caliper legs.

tended so as to "increaserthe measuringca- Fig. 6 is a detail view showing partially in section, the for holding the adjustable parts- 0 theimproved measuring tool.

. RQfQII'lDg more particularly ings, l andQYdesignate the main supporting to measuring tools and more part oularlyto calipers usedfor measuring the diameter of cylindrical or internal measuring.

arts the j caliper in: adjusted positions. Fig. 7 is a cross sectional view on the line of Fig, i sand Fig. 8 is a'iview of a nodifiedforin of to the draw- Specification ofLettersPatentr m" t t t;1,1 14 im licationai aiyia cirii,191,4; seria noysaaaae. i

v l a min yasis' shownat 3. The upper Y J. ROBINSON, A

terminal ends of the supporting legs land 2 V of the calipers have an arcuate spring t con- ,nected'thereto aiidarcliing over and above the ends of the caliper legs," so as to tend to spread'the legs 1 and 2 at all times, The r a spr ng 'has a handle5 secured to the upper- 1 f a most portion thereof, or theportion which is farthest from the pivotal point 3. of the" legs 1 and'2,,which handle: 5 is provided for v I the Convenient holding of the calipers during the actuation thereof 1 v The supporting leg'l of the calipers has a lug 6 secured to one side thereof, whieh lug has a screw threaded bar "7 secured thereto and extending laterally from the leg 1, bein 0 l a lyseated in a h1g8 which iscarried screw threaded bar 7 has an enlarged head 9 formed upon its free terminal end, which the le'gs and 2 of the ealiperin various rad ally ad usted positions, and also for adusting the legs formeasuring of the diam by the supporting legi2fof the calipers. The

1 head forms a ,restrainerforthe operation of ,the nut 1 0, which is ,adjustably 'inounted, I uponjthe screw threaded bar 7, for. holding With the foregoingl'and other objects in 'eter of variousc'ylindrical or round'bodies i The legsl and 2 of the calipers have their lower free ends recessed, for the insertion thereinto ofthe auxiliary legs jllfuand 12.

The lower terminal ends of the supporting legs 1' and 2 of the calipers are split upwardly, as is shown at 14 in Fig. 6 of the. drawings, and-the outer periphery of the portion of the legs which issplit, are pro-: I, vided with external screw .threads l5, upon p which are adjustably mounted theturn nuts l6., The nuts 16 have their outer surfaces corrugated, soyas to facilitate the operation or rotation thereofby the fingers of the perlow in cross sectionand they have slidably seated therein the r pointed rods 18 and :19.

onpopemun the calipers. "The auxiliary legsl ll and 12 which are slidably seated within-the supporting legs 1 and 2,1 are hol- The outer terminal ,ends of the rods 18. and l9,w vliichprojeot beyond the outer terminal endslof the auxiliarylegslland 12, are

pointed andf slightly. curved as is clearly shown inithe drawings, so asto provide die vider points, "when; it is desired to use the measuring tool ass dividers, and also to pro-- vide slightly curved surfaces, 1011 internal i or external measuring or gaging of circular ghoreslor bod es; U j I ,j a he rt m wa l hw s l w I legs '11 and 12 are slightly reduced: and split as are the outer terminal ends of the supporting legs 1 and 2 and the split portion 20 of the auxiliary legs 11 and 12 have nuts 21 rotatably mounted thereupon, which nuts are similar in construction tothenuts 16 which are mounted upon the lower ends of the supporting legs 1 and 2. In mounting the auxili'arylegs l1 and 12 within the.

supporting legs 1 and 2, the nuts 16, are rotated, so as to relieve the binding of the split ends of the supporting legs 1 and 2,

" and this will permit of the openings 14 to expand, to substantially their normal position, which will relieve the binding engagement between the terminal ends of the legs 1 and 2 and the outer peripheries of theauxiliary legs 11 and 12, permitting the auxiliary legs to be moved for various adjust,- ments, after which adjustments the nuts 16 are again rotated upon the terminal ends of the supporting legs 1 and 2, so as'to force the two sections of the split ends of the supporting legs inwardly and into binding engagement to the outer surface of the auxiliary legs, for securely holding the auxiliary legs in the adjusted position. v

The rods 18 and 19 are slidably mounted within the auxiliary sleeves 11 and 12," and the'adjustment thereof is controlled through the operation, ofthe nuts 21, which nuts operate in a manner identical with the nuts 16, for. compressing the two sections of the split ends of the auxiliary legs, for bind- 1ng engagement with the outer surfaces ofthe rods 18 and 19, for holding them inadjusted position.

The auxiliary legs 11 and 12 have slidably mounted thereupon collars-25 and 26, which collars have connected to one edge thereof arcuate arms 27 and 28. The arcuate arms 27 and 28 are oppositely curved, so

that their terminal ends 29, will coact for measuring the exterior of a cylindrical or circular body, when the two, arms 27 and 28 are positioned as is illustrated in Fig. 1 of the drawings, or so that the terminal ends will gage or measure the diameter of the bore when positioned as is illustrated in Figs. 3 and 4 of the drawings. The sleeves or collars 26 and 27 have sleeves 30 formed gagement with the outer surface and of the legs 11' and 12, for holding the collars 25 and 28.

and 26, and the arcuate arms 27 and 28 in various adjusted positions upon the auxiliary legs 11 and 12, so as to permit of greater or less measuring capacity of the arcuate arms.

In Fig. 1 of the drawings, the arcuate arms 27 and 28 are shown as mounted adj acent the terminal ends of the supporting legs 1 and 2 of the calipers, and extending inwardly toward the centralradius of the adjustment of the caliper legs, so as to measure the outside of various bodies, of relatively small diameter, and also the rods 18 and 19 are illustrated as having their .pointed ends curving inwardly, for purposes similar to the usage of the arcuate arms 27 "In Fig. 2 of the drawings, the arcuate arm forming hermaphrodite calipers. The auxiliary legs 11 and 12 are also shown as slightly extended out of the supporting sleevesl and 2 of the caliper legs so as to increase the measuring capacity of the calipers.

rIn Fig. 3 of the drawings, the auxiliary legs 11 and 12 are extended to their capacity, and the rods 18 and 19 are shown slightly extended, while the arcuate arms 27 and 28are at the upper terminus of their sliding'adjustment, so as to leave the pointed ends of'the rods l8'and .19 free from impediment by the arcuate arms, so as to permit of their free usage as the points of a pair of dividers.

27 is shown adjusted for coaction with the curved pointed ends of the rod 18, thus In Fig. 4 of the drawings, the arcuate arms 27 and 28 are shown extending outwardly from the center of the calipers forming what is commercially known as a pair of inside calipers, or calipers for measuring the diameter of bores, or internal measuring. The pointed ends 18 and 19 are also shown turned outwardly for the purpose of internal measurement. 1

In Fig. 5 ofthe drawings, the arcuate arms 27 and 28 are shown at the lower terminus of their adjustment, and extending inwardly toward the center ofthe calipers,

for external measuring, they being positioned so as to extend beyond the pointed ends of the rods 18 and 19, showing the calipers increased to their utmost capacity for outside'measuring, byshowingtheaux iliary legs 11 and 12 in their utmost exf tended position;

' In Fig. .8 of the drawings a modified form of the measuring too'lis shown, which tool has the supporting legs 40 and 41 thereof pivotally connected 'n'ear' their upper ends as at 42, and alsohave an arcuate spring 43 connected thereto, soas to force the sup:

porting legs 40 and 41 upwardly at all times, against the holding tension of the nut 44 which is adjustably mounted upon the screw threaded bar 45. The bar i's'ic'on ,nected to the supporting legs40 and 41 of the calipers in a manner similarxto the connection of the rod 7 to the'supporting legs 1 and 2 of the calipers. The supporting caliper legs 40 and 41 have their lower ends recessed, for the insertion thereinto of the upper terminal ends of the auxiliary legs 46 and 47 of the measuring tool. The auxiliary legs 46 and 47 of the measuring tool have a plurality of recesses 48- serially arranged radiating inwardly from their outer surfaces, which recesses are provided for the reception of the terminal ends of the clamping thumb screws 49. The clamp are controlled by the action of the adjustr.

ing thumb screws 54, which extend' 'through the sleeves and engage of the auxiliary' legs 46 and 47 engagement therewith i, to hold in various adjusted positions.

for binding the sleeves The sleeves 52 and 53 have arcuate arms 55 and 56- formed thereupon, wh ch arcuate arms are oppositely curved, as are the arcuate arms 27 and 28, so as to efliciently gage or'measure circular surfaces. The auxiliary legs 46 and 47, are hollow and have slidably seated therein rods 57 and 58, which rods have their lower terminal ends pointed and slightly curved as illustrated in Fig. 8. The

sliding adjustment of the rods 57 and 58 within the auxiliary legs 46 and 47 is controlled by the nuts 59, which are screw threadably mounted upon the lower split ends of the legs 46 andt47, The nuts 59 coact with thesplit ends of the auxiliary legs 46 and 47,1n a manner identical with legs the outer surfaces" the action of {the nuts 21, upon the split ends 20 ofthe legs 11 and 12, for holding the :rods 57 and 58 in various adjusted po sitions. i

From the foregoing description taken in connectionrwith the accompanying drawings the advantages of the construction and of the method of operation of the improved calipers will be readily apparent to those skilled in the art to which this invention appertains and, while inthe foregoingdee scription, the principle of the operation of thisinvention has been described together with variousfeatures of construction, it is to 'be; understood that certain minor features ofconstruction, combination and arrangement of parts maybe'altered to suit practical conditions provided suchalterations are comprehended within the scope of what is claimed;

hat I claim is 1. In a pair of calipers, pivoted supporting legs having split sleeves slidably mounted thereupon, arcuate arms formed upon said sleeves, and means coacting with said split sleeves for binding them in engagement with said supporting legs for holding said sleeves in adjusted position.

2min a pair of calipers, pivoted supporting' legs, pointed divider rods adjustable I upon'said supporting legs for increasing or for holding said rods in adjusted position, and arcuate arms slidably mounted upon said rods.

3. in apair of calipers, pivoted'support ing legs, pointed divider rods adjustable upon said supporting legsfor increasing or decreasing the stroke of the dividers, means for holding said rods in adjustedpositions, arcuate arms slidably mounted upon said rods, and means for, holding said arms in adjusted positions. p i

in testimony whereof I aflix my signature in presence of two witnesses.

" I' PHILIP J. ROBINSON. Witnesses: I

ALDERIE "Fuennn, EDMOND Fuonnn.

Copies of this patent'may be obtained for five eentseach, by addressing the Commissioner of Patents,

- Washingtoml). C.

decreasing the stroke of the dividers, means a 

